Lighting fixture



LIGHTING FIXTURE Filed Dec. 12, 1941 2 Sheets-Sheet 1 11. ig/Fed 0. and

afiangille Kenneth Ibrkim 7, M

April w. o. LIANGILLE ET AL 2,347,420

LIGHTING FIXTURE Filed Dec. 12, 1941 2 Sheets-Sheet 2 liennethperfiins Patented Apr. 25, 1944 UNITED STA'IES liATEN-T -FFICE L'JGHTING FIXTURE Wilfred 0.. Langille, Chester, and Kenneth Perkii S. Scotch Blains, N. J., assignors to The Singer Manufacturing Company, Elizabeth, N. J1, a corporation of New Jersey Application December 12, 1941', Serial No. 422,608

7 Claims. (01. 240-214) invention relates to an improvement in electric lighting,- fixtures, and more particularly, to lighting fixtures used for sewing machines and made of separable elements of molded insulating material.

A primary object of'the invention is to provide an improved lighting fixture of the type above referred to wherein separabl'e'shade, reflector and lens elements are so secured to a supported lamp-receiving socket as to provide a unitary enclosure for a lamp held in said" lamp-receiving socket; which enclosure may be readily removed to adequately expose the lamp to facilitate its replacement.

Another object of this invention is to provide an improved lighting fixture of'pleasing appearance comprising interfitting components which maybe readily assembled into a sturdy, compact unit and secured together without the use of screws or similar fastening means which penetratethe body of said components.

A further object of this invention is to provide, in a lighting fixture, an improved means for supporting a lens and shade having edgeportions in mutual surface contact, which supporting means yields only in a direction to engage and disenga e the edge-portions of said lens and shade. i v I With the above and other objects in view, as will hereinafter appear, the invention comprises the devices, combinations and arrangements; of parts hereinafter set forth and illustrated in the accompanying drawings of certain specific em-, bodiments of the invention from which the several features of the invention and the advan: tages attained thereby will be readily understood by those skilled in the art. 7 I

In the accompanying drawings, Fig. 1. is an elevational view of a sewing machine having mounted on its rear side a lighting. fixture em.- bodying the invention. 7

Fig. 2 is a. longitudinal vertical sectional view, Partly in elevation, o a htin fixture. il1ustrating one embodiment of. the invention.

Fig. 3 is a. vertical. section. on the 1ine= 3 .-=3. Fig. 2.

Fig. 4 is a top plan view of the-deviceshown in Fig. 2.

Fig. 5 is a leftend view of thedevice shown in Fig. 2. v

Fig. 6-isa bottom view of the switch-housingportion of the upperhalf:of:the.1ightingfixture showing a, switch mechanism andmeans for onducting current tow-lamp.

Fig. 7 is a perspective View of the lighting fixture showing a shade containing a reflector partially-withdrawn from a lamp-receiving socket along a lens-supporting member.

Fig. 8 is a fragmentary perspective view of a lighting fixture showing a modified means for securing a lens-supporting member toa lampreceiving socket.

Fig. 9 is a fragmentary top plan View of the modification shown in Fig. 8.

Fig. 10 is-a vertical section on the line Ill-l0, Fig. 9. I

Fig. 11 is a fragmentary perspective viewof a lighting'fixture showing a further modification of means for securing a lens-supporting member to a lamp-receiving socket.

Fig'. 12 is a top plan view, partly in section. of the modified device shown in Fig. ll.

Referring more particularly to the drawings, Fig. '1 portrays a lighting fixture I, embodying the invention and mounted on the rear side of a sewing machine comprising, the cloth plate 2, anda frame including a standard 3, bracketarm 4', and head 5. Fig. 1"a1so shows a preferred means of attaching the lighting fixture i to the sewing machine by securing a bracket 6, carrying said fixture, within a recess in the frame beneath a cover-plate l by means ofthe single screw I in the manner shown and described in the U. S. patent to Chason, No. 1,546,619, of July 21, 1925. I

The lighting fixture itself, as shown best in Fig. 2, comprises an upper inverted troughshaped shade element 8, and an adjacent cylindrical. split housing forming a lamp-receiving socket 9 containing bayonet slots 9 for receiving a lamp It] and including an upper casing 9 and a lower casing 9 preferablymade of Bakelite or some other suitable dielectric molding material and adapted to be interfitted together to. form a smooth unbroken exterior surface of pleasing appearance. A lens-supporting means is preferably formed with two, opposed, spaced apart prong-like members l-l, seated at one end within surface recesses l2 formed in the casings 9 and 9 and secured therein by snap rings l3 and M, as shown most clearly in Fig. '7. 'The prong-like members H are formed at one end with a shank portion l5, shaped on the outer surface to conform to the cylindrical periphery of the lamp-receiving socket 9 and having complementary pressed-in transverse grooves l6 and I which are engaged by the wire snap-rings-lS and= M; respectively;--as 'sh0wn best/in Fi 4; In

order to prevent the members II from being pulled endwise out of the recesses l2, well-defined circumferential grooves l8 and T9 are formed in the periphery of casings 9 and 9 to provide a positive seat for the rings l3 and I4 in which they are firmly held by the inward pressure exerted by the expanded rings l3 and i4.

The spaced apart prong-like members project in an axial direction from one end of the split housing and are displaced outwardly to gain Wider separation and to form a transition portion 29 in which the cross-section is changed from substantially a rectangular shape to a channel shape, as seen most clearly in Fig. 7. It will be apparent from this description that the transition portion acts like a leaf spring and provides a lateral resiliency for the members H such that they may be made, even when in opposed parallel relation, to exert considerable inwardly-directed spring pressure to retain members held between them.

Integral flanged edge-portions 2| of the shade 8 are formed with a cut-away portion 22 adapted to receive edge-portions 23 of a semi-cylindrical reflector 24 and edge-portionsjli of a semi-cylindrical lens or light-transmitting member 26 in stacked edge-to-edge contact to form an enclosure for the lamp as shown best in Fig. 3. This composite enclosure presents a built-up laminar edge portion which is slidably embraced by the channel-section portion of the prong-like members H, as is clearly shown in Fig. 3. The outer ends of the lens-supporting members terminate in deformed portions 21 which releasably engage complementary portions 28 formed in the edge portion 2| of the shade 8 when the enclosure defined by the shade, reflector and lens has been slidably inserted to its extreme position within the support formed by the members I as seen in Fig. 4. In this way, the shade, reflector and lens are retained in operative position and are protected against accidental removal from the lens-support. The casing 9 is formed at one end with an annular external shoulder portion 29 which is engaged in overlapping relation by a corresponding shoulder portion 30 formed on the shade 8, to form a light-tight, separable joint as best seen in Figs. 2 and '7.

The reflector 24 is preferably formed of thin metal and is positioned within the shade as shown in Fig. '7, the out-turned edge-portions 23 resting in edge-to-edge contact with the shade and within that portion 22 of the shade formed by cutting away part of the edge-portion. In this position the reflector cannot be displaced axially relative to the shade. To removably retain the reflector 24 within the shade 8, resilient ears 3| are struck up from the reflector body and are bent outwardly to press against the inside surface of the shade. Further, the edge portions 23 of the reflector 24 are formed with struck-up spring fingers 32 which yield slightly to take up slack and provide a snug fit between the laminar stack of edge-portions 2|, 23 and 25, and the channel-section of member II, as isseen best in Fig. 3. The lens 26 is positioned within the cut-out portion 22 of the shade 8 and in laterally spaced-apart relation with portions of the shade and split housing so as to provide inlets 33 and .34 for cooling air which is drawn therethrough into the lamp enclosure and is circulated around the lamp and shade by convection, as shown by the arrows in Fig. 2, and is finally discharged through the lon- 7 gitudinal outlet slits 35 in the top of the shade.

The switch structure, shown generally in Fig. 6, comprises well-known mechanisms including the turn-button 35 which extends vertically through the top of the upper casing 9 as best seen in Fig. 2. Spring contacts 38 secured by rivets to the insulating button 3'! which is held in a receiving-pocket formed jointly in casings 9 and 9 conduct current to the lamp terminals Ill when the switch is closed by operating the turn-button 35.

In assembling the lighting fixture described above, it is evident that no screws or similar fastening devices which penetrate the body of the fixture are necessary. The three wire snap rings l3, l4 and 38 embracing the split housing constitute the sole means for securing together the component parts of this lighting fixture. This construction is of special advantage in contributing to the general pleasing appearance and safety of the fixture against electric shock inasmuch as there are no conducting paths here provided between the interior and the exterior of the fixture whereby to expose the user to harmful voltages which may be carried by the interior metallic parts nor are there any surface-piercing fastening elements to interrupt smooth-flowing external contours.

A modification of the lighting fixture described above is shown in Figs. 8, 9 and 10, wherein the lens-supporting member is formed from a single piece comprising a band-like shank portion 49 which is seated within a complementary circumferential recess 42 formed in the peripheral surfaces of the upper casing 39 and lower casing 39 forming the lamp-receiving socket 39 having internal bayonet slots 39 for receiving a lamp Ill. Formed integrally with the band-like shank portion 48 are the prong-like portions 4| which are of the same form aselement, N, (Fig. 7). In this modified construction, the shank portion 40 is split longitudinally to allow circumferential yielding and embraces the lamp-receiving socket in an expanded condition so as to exert inwardly-directed pressures not only to assist the snap ring 38 in holding the casings 39 and 39 together but also to detachably anchor the supporting member 4| securely to the lampreceiving socket 39.

In the form shown in Figs. 11 and 12 the prong-like supporting members 5| have deformed ends comprising resilient portions 53 struck up from the body of the member, said deformed ends being seated within complemental internal receiving pockets 54 axially disposed in the bodies of casings 59 and 59 so that when the casings are secured together in assembled condition by means of the snap rings 38 and 52, the supporting members 5| are securely anchored within the lamp-receiving socket 59 equipped With bayonet slots 59. It is clear from this description that the supporting members 5| have embedded portions 54 which stand at right angles to the axis of the lamp-receiving socket and emerge from the interior of said socket through the slots 55 formed jointly in casings 59 and 59 The remainder of the supporting member 5| follows the form of member M (Fig. 7), and has been hereinbefore completely described. Y

In all the forms described herein, the composite lamp enclosure comprising the shade, re-- flector, and lens assembly may be jointly removed from the lighting fixture by the simple manipulation of gripping the shade member and sliding it endwise along the guideway provided 'by the prong members ll, 4| or 51, thus completely exposing the lamp and rendering its replacement a direct and easy matter.

From the foregoing it will be perceived that We have provided an improved ventilated lighting fixture of pleasing appearance in which no metal fasteners, which penetrate the interior of the component parts, are used and in which a shade, a reflector and a lens may be readily removed as a composite unit from a supported lamp-receiving socket to render the socket adequately accessible for replacing a lamp therein.

It will be obvious to those skilled in the art that the invention may, without departure from its essential attributes, be embodied in various specific forms other than those shown and described, which latter are to be considered in all respects as illustrative of the invention and not restrictive; reference being had to the appended claims rather than to the foregoing description to indicate the scope of the invention.

Having thus set forth the nature of the invention What we claim herein is:

l. A lighting fixture comprising a lamp-receiving socket, resilient prong-like members of channeled section carried by and projecting from said socket, and shade and reflector elements having out-turned juxtaposed edge-portions slidably received in the channels of said prong-like members.

2. A lighting fixture comprising a lamp-receiving socket, resilient prong-like members of channeled section carried by and projecting from said socket, and shade, reflector and lens elements having out-turned juxtaposed edge-portions received in the channels of said prong-like members.

3. A lighting fixture comprising a, lamp-receiving socket formed with surface recesses, resilient prong-like members of channeled sections carried at one end within said recesses and projecting endwise from said socket, and shade and reflector elements having out-turned edge-portions slidably received in the channels of said prong-like members.

4. A lighting fixture comprising a lamp-receiving socket formed with surface recesses, resilient prong-like members of channeled section carried at one end within said recesses and projecting at the other end from said socket, and shade, reflector and lens elements having outturned edge-portions slidably received in the channels of said prong-like members.

5. A lighting fixture comprising a lamp-receiving socket, resilient, spaced apart, prong-like members of channeled section carried by and projecting longitudinally from said socket to form a resilient guideway, and shade and reflector elements forming a separable unitary structure supported by said prong-like, members and slidably received in said guideway.

6. A lighting fixture comprising a lamp-receiving socket, resilient, spaced apart, pronglike members of channeled section carried by and projecting longitudinally from said socket to form a resilient guideway, and shade, reflector, and lens elements having complementary outwardly-flanged edge-portions slidably confined by the channels of said prong-like members to provide a composite removable enclosure for a lamp.

7. A lighting fixture comprising a cylindrical lamp-receiving socket, laterally yieldable pronglike members carried by said socket and extending along the axis thereof, and inverted troughshaped shade and reflector elements having juxtaposed complementary straight edge portions slidably received between and supported by said prong-like members.

WILFRED O. LANGILLE. KENNETH PERKINS. 

